Creating 2 Wordpress Plugins Related to tags

The site is [login to view URL] The site is hosted on Blue host, uses Weaver Theme (2010 Weaver 1.4) and Wordpress in Hebrew 3.0.2. The site will soon be upgraded to the latest version of wordpress. I want 2 plugins to perform the following functionality: 1. Auto tag buy author - all the posts a specific author writes should be able to automatically be tagged with a certain predefined tag. I want to be able to have a menu in the admin panel to define what is the automatic tag to be allocated to each author. This should not be able to be overridden by the author if I choose so. I want to be able to define in the menu that certain authors will be able to choose there own tags. 2. Customize the header image for Tag Pages. The site has several tag pages, and more will be added in the future: [login to view URL] [login to view URL] etc.. I want to have a menu in the admin panel to be able to change the header image for each of these tag pages. In this menu I should be able to upload images and set them as the header image of a certain Tag page. The solution should stand future upgrades of wordpess and the theme. The freelancer should: Have experience in PHP and Wordpress.